We do it 12 times a week. The performance is better out of a 3/4 @ 12 gpm because the checks fully open and do not "float." Like you said, it fits better in the box and you can get the wye strainer in the box and service it easily.

Do it!Posted via Mobile Device

let me back up a little...when you install 3/4" backflows, are you using 1" PVC for your systems or 3/4"?